Drums with cylindrical shells can be open at one end (as is the case with timbales), or can have two drum heads, one head on each end. Single-headed drums typically consist of a skin stretched over an enclosed space, or over one of the ends of a hollow vessel. Drums with two heads covering both ends of a cylindrical shell often have a small hole somewhat halfway between the two heads; the shell forms a resonating chamber for the resulting sound. Exceptions include the African slit drum, also known as a log drum as it is made from a hollowed-out tree trunk, and the Caribbean steel drum, made from a metal barrel. Drums with two heads can also have a set of wires, called snares, held across the bottom head, top head, or both heads, hence the name snare drum.[1] On some drums with two heads, a hole or bass reflex port may be cut or installed onto one head, as with some 2010s era bass drums in rock music.

After spending 29 hours researching 21 models and testing seven with a panel of professional and amateur pianists, we think the Casio Privia PX-160 is the best budget digital piano for beginners. It suitably replicates the feel of an acoustic piano and has some of the most realistic sounds we’ve heard in this price category, and its dual headphone outputs accommodate both student and teacher.
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Three sounds (Grand Piano Concert, Grand Piano Modern, and Elec. Piano 1) have dedicated buttons on the control panel. Selecting any of the other 15 sounds requires the player to press the Function button and a corresponding piano key labeled with the name of the sound, such as Vibraphone or Jazz Organ. The keys used for instrument selection are in the middle of the keyboard, starting at middle C, for easy accessibility. Some other keyboards that use this selection method have the selection keys assigned to the bottom octave of the keyboard, which can make changing sounds a bit more difficult because you have to look and reach down to the far left end of the keyboard. If you have a library of sounds on your computer, the Casio Privia PX-160 can be used as a controller by connecting it to your computer via USB.
Swing drummers such as Max Roach and Kenny Clarke had already deviated from the large marching band-style bass drums, finding that they were too loud and boomy. Bebop drummers continued this trend, and they started trying out smaller bass drum sizes in the drum set. Bebop drummers' experimentations with new drum sizes and new sounds led to the innovative concept of applying the busy "four on the floor" bass drum rhythms to a new larger cymbal called the ride cymbal. By focusing on keeping time on the new ride cymbal instead of the bass drum, the "feel" went from bass drum and hi-hat heavy, to a lighter melodic feel that has been explained as "floating on top of the time". This allowed drummers to express themselves in a more melodic fashion by playing the rhythms used by the guitar, piano and sax players using the new smaller, more focused bass drums and snare. Louie Bellson also assisted in the innovative sizes and sounds of the 1940s drum set by pioneering the use of two bass drums, or the double bass drum kit.

The fretting hand can also be used to sound notes, either by plucking an open string with the fretting hand, or, in the case of a string that has already been plucked or picked, by "hammering on" a higher pitch or "pulling off" a finger to pluck a lower fretted or open stringed note. Jazz bassists use a subtle form of fretting hand pizzicato by plucking a very brief open string grace note with the fretting hand right before playing the string with the plucking hand. When a string is rapidly hammered on, the note can be prolonged into a trill.